Post on 25-Feb-2016
description
Printed Circuit Board Design
Design Team 6Alex Volinski
Derek BrowerPhil Jaworski
Jung-Chung LuMatt Affeldt
Software Packages Schematic Advantages Schematic creation
◦ Libraries◦ ERC and simulation
Schematic to Layout
Software Flow-Schematic
Layout◦ Libraries◦ Layers and Routing◦ Labels◦ DRC
Fabrication
Software Flow-Layout
Important Terminology◦ Layers
Metal Silkscreen Solder mask
◦ Traces◦ Spaces◦ Trace/Space
Routing/Board layout
Layout by importance of Position Align componentsin a common-senseapproach
Floor Plan
Regulators
Sensor IO
Sensor IO
Memory
User I/O
Micro-controller
JTAG
USB/UART
Routing in PCB Artist◦ Place components inside green PCB border◦ Yellow lines are connections that need to be made
Floor Plan
Grounding Techniques◦ Series
Common Impedance◦ Parallel
Low Potentials High Impedance
◦ Multipoint Contains Currents Reduces Inductance
Floor Plan
Power Distribution◦ Single-Point
Single Reference◦ Multipoint
Impedance Coupled◦ Star Distribution
Central Reference Equal Lengths
Floor Plan
Avoiding Radiating EMI At ‘low’ frequencies (<100 MHz) no
components will be antennas Be aware of attached cables Layout board to reduce coupling
Avoiding Antennas
Software Flow◦ Advantage of making schematic◦ Layers, Libraries, Fabrication
Routing / Board Layout◦ Layers, Traces, Pads vs. Vias◦ Importance of position◦ Grounding Techniques, Power Distribution
Conclusion
Components/Assembly◦ Different types of components◦ Through Hole / Surface Mount◦ Weighing options for better performance
Electrical considerations◦ Stray Capacitance ◦ Ground Plane Traces◦ Antennas to avoid radiating EMI
Conclusion